Array substrate and method for fabricating same, and method for detecting alignment accuracy

ABSTRACT

The present disclosure provides an array substrate and a method for fabricating the same, a method for detecting alignment accuracy, and a liquid crystal display panel, wherein a dummy color resist unit is disposed on a periphery of a display area of a substrate, and a side or a center point of the dummy color resist unit is designed to be at a predetermined distance from an adjacent signal line. Therefore, it is only necessary to measure a distance between the side or the center point of the dummy color resist unit and a signal line adjacent to it, and compare the measured distance with the predetermined distance to estimate alignment accuracy of color resist units. It is not necessary to dispose detection units in a non-display area of the array substrate so that an area of the non-display area can be reduced to achieve ultra-narrow frame design.

RELATED APPLICATIONS

This application is a National Phase of PCT Patent Application No.PCT/CN2019/121906 having International filing date of Nov. 29, 2019,which claims the benefit of priority of Chinese Patent Application No.201910971862.1 filed on Oct. 14, 2019. The contents of the aboveapplications are all incorporated by reference as if fully set forthherein in their entirety.

FIELD AND BACKGROUND OF THE INVENTION

The present disclosure relates to the field of thin-film transistorliquid-crystal display (TFT-LCD) technology, and particularly to a COA(color filter on array) array substrate and a method for fabricating thesame, a method for detecting alignment accuracy, and a liquid crystaldisplay panel.

In the prior art, in order to detect alignment accuracy of a colorresist layer in a COA (color filter on array) array substrate, aplurality of detection units are generally disposed in a non-displayarea of the COA array substrate to detect whether positions of colorresist units in the color resist layer match designed positions of colorresist units. Please refer to FIG. 1 and FIG. 2. FIG. 1 is a schematicdiagram of a COA array substrate 10 provided with detection units 20 inthe prior art. FIG. 2 is a schematic diagram of a detection unit 20 inthe prior art. In the prior art, a plurality of detection units 20 aregenerally provided in a non-display area 14 of a COA array substrate 10to detect alignment accuracy of a color resist layer (not shown) in adisplay area 12. A typical detection unit 20 comprises a metal frame 22and a color resist block 24 disposed in the metal frame 22. The colorresist block 24 is formed simultaneously with the color resist layer.The metal frame 22 is usually simultaneously formed with a gateelectrode. By measuring a distance between each side of the color resistblock 24 and a side of the metal frame 22 adjacent to and parallel toit, and comparing the measured distance with a designed distance,alignment accuracy of the color resist layer is estimated.

Currently, narrow-frame liquid-crystal display panels are favored byusers because of their high screen ratio. Therefore, how to achieveultra-narrow frame design has become a focus of research and developmentin enterprises. However, with the development of technology, design oftraces in a non-display area of a COA array substrate becomes morecomplicated. Therefore, if additional detection units are still to bedisposed in a non-display area of a COA array substrate, it will limitnarrowing of a frame of a display panel. Please refer to FIG. 1 and FIG.2, disposing the additional detection units 20 in the non-display area14 will limit narrowing of the non-display area 14. Therefore, it isnecessary to develop a new array substrate and a method for fabricatingthe same, a method for detecting alignment accuracy, and a liquidcrystal display panel to solve the above technical problems.

SUMMARY OF THE INVENTION

In order to solve the above technical problem, the present disclosureprovides a method of fabricating an array substrate. The methodcomprises: providing a substrate comprising a display area; forming aplurality of thin-film transistors and a plurality of signal lines onthe display area of the substrate, wherein each of the thin-filmtransistors comprises a gate electrode layer electrically connected to acorresponding signal line; and forming a plurality of color resist unitson the thin-film transistors in the display area while forming a dummycolor resist unit on a periphery of the display area of the substrate,wherein a side or a center point of the dummy color resist unit isdesigned to be at a predetermined distance from one of the signal lines.

The present disclosure further provides an array substrate comprising asubstrate, a plurality of thin-film transistors, a plurality of signallines, a plurality of color resist units, and a dummy color resist unit.The substrate comprises a display area. The thin-film transistors aredisposed on the display area of the substrate. Each of the thin-filmtransistors comprises a gate electrode layer. The signal lines aredisposed on the display area of the substrate and electrically connectedto the gate electrode layers of the thin-film transistors. The colorresist units are disposed on the thin-film transistors in the displayarea. The dummy color resist unit is disposed on a periphery of thedisplay area of the substrate. A side or a center point of the dummycolor resist unit is designed to be at a predetermined distance from oneof the signal lines.

The present disclosure further provides a liquid crystal display panelcomprising the aforementioned array substrate. The present disclosurefurther provides a method for detecting alignment accuracy of a colorresist layer. The method comprises providing an array substratecomprising a display area. The display area is provided with a pluralityof thin-film transistors, a plurality of signal lines electricallyconnected to the thin-film transistors, a plurality of color resistunits disposed on the thin-film transistors, and a dummy color resistunit disposed on a periphery of the display area. A side or a centerpoint of the dummy color resist unit is designed to be at apredetermined distance from one of the signal lines. After providing thearray substrate, the method further comprises measuring a distance ofthe side or the center point of the dummy color resist unit to thesignal line designed to be at the predetermined distance from the sideor the center point and comparing the measured distance with thepredetermined distance.

In an embodiment, the dummy color resist unit is formed at a corner or aside of the display area of the substrate.

In an embodiment, the dummy color resist unit is shaped as a triangle, aquadrangle, a hexagon, an octagon, a circle, an L-shape, a T-shape, across shape, or a combination thereof.

In an embodiment, the dummy color resist unit is shaped as a quadrangle,and each side thereof is designed to be at the predetermined distancefrom a signal line adjacent and parallel thereto.

In an array substrate and a method for fabricating the same, a methodfor detecting alignment accuracy, and a liquid crystal display panelwhich are provided by embodiments of the present disclosure, a dummycolor resist unit is disposed on a periphery of a display area of asubstrate, and each side of the dummy color resist unit is designed tobe at a predetermined distance from an adjacent signal line. The sidesof the dummy color resist unit have different, same, or partially-samepredetermined distances. Therefore, it is only necessary to measure adistance between each side of the dummy color resist unit and a signalline adjacent to it, and compare the measured distance with thepredetermined distance to estimate alignment accuracy of color resistunits. The array substrate and the method for fabricating the same, themethod for detecting alignment accuracy, and the liquid crystal displaypanel do not need to dispose detection units in a non-display area ofthe array substrate, so that an area of the non-display area can bereduced to achieve ultra-narrow frame design of the display panel. Thissolves the problem of limiting narrowing of a frame of a display paneldue to detection units being disposed in a non-display area of a COAarray substrate in the prior art.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in theembodiments of the present disclosure, a brief description ofaccompanying drawings used in the description of the embodiments of thepresent disclosure will be given below. Obviously, the accompanyingdrawings in the following description are merely some embodiments of thepresent disclosure. For those skilled in the art, other drawings may beobtained from these accompanying drawings without creative labor.

FIG. 1 is a schematic diagram of a COA (color filter on array) arraysubstrate provided with detection units in the prior art.

FIG. 2 is a schematic diagram of a detection unit in the prior art.

FIG. 3 is a schematic diagram of a COA array substrate provided withdummy color resist units according to an embodiment of the presentdisclosure.

FIG. 4 is an enlarged view of an X region in FIG. 3.

FIG. 5 is a sectional view taken along line B-B′ in FIG. 3.

FIG. 6, FIG. 7, FIG. 8, FIG. 9 and FIG. 10 are schematic flowcharts of amethod for fabricating an array substrate according to an embodiment ofthe present disclosure as shown in FIG. 5.

DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION

Please refer to FIG. 3 to FIG. 10. FIG. 3 is a schematic diagram of aCOA array substrate 100 provided with dummy color resist units 130according to an embodiment of the present disclosure. FIG. 4 is anenlarged view of an X region in FIG. 3. FIG. 5 is a sectional view takenalong line B-B in FIG. 3. FIG. 6 to FIG. 10 are schematic flowcharts ofa method for fabricating an array substrate according to an embodimentof the present disclosure as shown in FIG. 5. The present disclosureprovides a method of fabricating an array substrate comprising stepsS1-S3.

Step S1: providing a substrate 101 comprising a display area 110 and anon-display area 120 surrounding the display area 110. The substrate 101may be a rigid substrate, such as a glass substrate, but is not limitedthereto.

Step S2: forming a plurality of thin-film transistors 150 and aplurality of signal lines 140 on the display area 110 of the substrate101. Each of the thin-film transistors 150 comprises a gate electrodelayer 151, an insulating layer 152, an active layer 153, and asource-drain layer 154. The signal lines 140 and the gate electrodelayer 151 of the thin-film transistors 150 are made of a same materialat a same time and are electrically connected to each other.

Step S3: forming a plurality of color resist units 124 on the thin-filmtransistors 150 and the substrate 101 in the display area 110, andsimultaneously forming a dummy color resist unit 130 on a periphery ofthe display area 110 of the substrate 101 with a same material as thecolor resist units 124. A side or a center point of the dummy colorresist unit 130 is designed to be at a predetermined distance from oneof the signal lines 140. The color resist units 124 may be red, blue,and green photoresist blocks. The red, blue, and green photoresistblocks may be arranged in a triangular configuration, a squareconfiguration, a linear configuration, or a mosaic configuration in thedisplay area 110. The color resist units 124 may be made by using adyeing method, an etching method, a printing method, a dry film method,or an electrodeposition method, but is not limited thereto. The dummycolor resist unit 130 may be a red, blue or green photoresist block.Specifically, the dummy color resist unit 130 is made of a same materialas the red, blue, or green photoresist blocks of the color resist units124.

In an embodiment, the dummy color resist unit 130 is disposed at acorner or a side of the display area 110 of the substrate 101. In anembodiment, a number of the dummy color resist unit 130 may be two,which are respectively disposed at two diagonally opposite corners, twocorners of a same side, two opposite sides, or two adjacent sides of thedisplay area 110. In an embodiment, the number of the dummy color resistunit 130 may be four, which are respectively disposed on four corners orfour sides of the display area 110. However, the number and a setposition of the dummy color resist unit 130 are not limited thereto.

In an embodiment, the dummy color resist unit 130 may be designed as atriangle, a quadrangle, a hexagon, an octagon, a circle, an L-shape, aT-shape, a cross shape, or other suitable shapes. Preferably, the dummycolor resist unit 130 is shaped as a quadrangle and has a first side131, a second side 132, a third side 133, and a fourth side 134. Thesignal lines 140 comprise a first signal line 141, a second signal line142, a third signal line 143, and a fourth signal line 144 which areadjacent to and parallel to the first side 131, the second side 132, thethird side 133, and the fourth side 134, respectively. The dummy colorresist unit 130 is set as follows: the first side 131 is at apredetermined distance a from the first signal line 141, the second side132 is at a predetermined distance b from the second signal line 142,the third side 133 is at a predetermined distance c from the thirdsignal line 143, and the fourth side 134 is at a predetermined distanced from the fourth signal line 144. The predetermined distances a, b, c,and d may be equal, unequal, or partially equal.

In an embodiment, step S2 further comprises: forming a plurality ofdriving circuits 160 on the non-display area 120 of the substrate 101.The driving circuits 160 are made of a same material as the gateelectrode layers 151 of the thin-film transistors 150 and the signallines 140. The driving circuits 160 are electrically connected to thesignal lines 140 and a common voltage generating circuit (not shown).The common voltage generating circuit is configured to generate a commonvoltage. The common voltage makes the driving circuits 160 to generatedriving signals to the gate electrode layers 151 of the thin-filmtransistors 150 to control switching of the thin-film transistors 150.

In an embodiment, the insulating layers 152 of the thin-film transistors150 extend to cover the signal lines 140 and the driving circuits 160.

In an embodiment, after step S2, the method further comprises step S21:forming a protective layer 155 to cover the thin-film transistors 150.The protective layer 155 is made of an insulating material. Theprotective layer 155 may be made of a polymer insulating material suchas epoxy resin, acrylic resin, polyimide resin, and polyvinyl alcoholresin, but is not limited thereto.

In an embodiment, after step S3, the method further comprises step S32:forming an overcoat layer 170 to cover the color resist units 124 andthe dummy color resist unit 130.

In an embodiment, between step S3 and step S32, the method furthercomprises step S31: forming a light-shielding layer (i.e., a blackmatrix (BM), not shown). The light-shielding layer 122 is configured toshield areas other than the color resist units 124 to (1) prevent lightleakage from a backlight of a thin-film transistor liquid-crystaldisplay, thereby improving a contrast ratio of the display; (2) preventthree primary color lights, generated by light from the backlightpassing through adjacent red, blue, and green photoresist blocks of thecolor resist units 124, from being mixed, thereby improving color purityof the display, and (3) prevent light from causing malfunction of thethin-film transistor 111 and changing the operating parameters of thethin-film transistors 111. The light-shielding layer 122 may be composedof a black resin, a single-layer of chromium (Cr), or a double-layer ofchromium (Cr)/chromium oxide (CrOx).

In an embodiment, after step S32, the method further comprises step S33:forming a plurality of columnar photo spacers (not shown) on theovercoat layer in the display area to prevent a cell gap of the displayfrom being changed due to pressure. The photo spacers have a same heightto maintain uniformity of the cell gap.

The present disclosure further provides an array substrate 100 made bythe above method. The array substrate 100 comprises a substrate 101, aplurality of thin-film transistors 150, a plurality of signal lines 140,a plurality of color resist units 124, and a dummy color resist unit130. The substrate 101 comprises a display area 110 and a non-displayarea 120 surrounding the display area 110. The substrate 101 may be arigid substrate, such as a glass substrate, but is not limited thereto.The thin-film transistors 150 are disposed on the display area 110 ofthe substrate 101. Each of the thin-film transistors 150 comprises agate electrode layer 151, an insulating layer 152, an active layer 153,and a source-drain layer 154. The signal lines 140 are disposed on thedisplay area 110 of the substrate 101. The signal lines 140 and the gateelectrode layer 151 of the thin-film transistors 150 are made of a samematerial and are electrically connected to each other. The color resistunits 124 are disposed on the thin-film transistors 150 and thesubstrate 101 in the display area 110. The color resist units 124 may bered, blue, and green photoresist blocks. The red, blue, and greenphotoresist blocks may be arranged in a triangular configuration, asquare configuration, a linear configuration, or a mosaic configurationin the display area 110. The color resist units 124 may be made by usinga dyeing method, an etching method, a printing method, a dry filmmethod, or an electrodeposition method, but is not limited thereto. Thedummy color resist unit 130 is disposed on a periphery of the displayarea 110 of the substrate 101. The dummy color resist unit 130 is madeof a same material as the color resist units 124. A side or a centerpoint of the dummy color resist unit 130 is designed to be at apredetermined distance from one of the signal lines 140. The dummy colorresist unit 130 may be a red, blue, or green photoresist block.Specifically, the dummy color resist unit 130 is made of a same materialas the red, blue, or green photoresist blocks of the color resist units124.

In an embodiment, the dummy color resist unit 130 is disposed at acorner or a side of the display area 110 of the substrate 101. In anembodiment, a number of the dummy color resist unit 130 may be two,which are respectively disposed at two diagonally opposite corners, twocorners of a same side, two opposite sides, or two adjacent sides of thedisplay area 110. In an embodiment, the number of the dummy color resistunit 130 may be four, which are respectively disposed on four corners orfour sides of the display area 110. However, the number and a setposition of the dummy color resist unit 130 are not limited thereto.

In an embodiment, the dummy color resist unit 130 may be designed as atriangle, a quadrangle, a hexagon, an octagon, a circle, an L-shape, aT-shape, a cross shape, or other suitable shapes. Preferably, the dummycolor resist unit 130 is shaped as a quadrangle and has a first side131, a second side 132, a third side 133, and a fourth side 134. Thesignal lines 140 comprise a first signal line 141, a second signal line142, a third signal line 143, and a fourth signal line 144 which areadjacent to and parallel to the first side 131, the second side 132, thethird side 133, and the fourth side 134, respectively. The dummy colorresist unit 130 is set as follows: the first side 131 is at apredetermined distance a from the first signal line 141, the second side132 is at a predetermined distance b from the second signal line 142,the third side 133 is at a predetermined distance c from the thirdsignal line 143, and the fourth side 134 is at a predetermined distanced from the fourth signal line 144. The predetermined distances a, b, c,and d may be equal, unequal, or partially equal.

In an embodiment, the array substrate 100 further comprises a pluralityof driving circuits 160 disposed on the non-display area 120 of thesubstrate 101. The driving circuits 160 are made of a same material asthe gate electrode layers 151 of the thin-film transistors 150 and thesignal lines 140. The driving circuits 160 are electrically connected tothe signal lines 140 and a common voltage generating circuit (notshown). The common voltage generating circuit is configured to generatea common voltage. The common voltage makes the driving circuits 160 togenerate driving signals to the gate electrode layers 151 of thethin-film transistors 150 to control switching of the thin-filmtransistors 150.

In an embodiment, the insulating layers 152 of the thin-film transistors150 extend to cover the signal lines 140 and the driving circuits 160.

In an embodiment, the array substrate 100 further comprises a protectivelayer 155 covering the thin-film transistors 150. The protective layer155 is made of an insulating material. The protective layer 155 may bemade of a polymer insulating material such as epoxy resin, acrylicresin, polyimide resin, and polyvinyl alcohol resin, but is not limitedthereto.

In an embodiment, the array substrate 100 further comprises an overcoatlayer 170 covering the color resist units 124 and the dummy color resistunit 130.

In an embodiment, the array substrate 100 further comprises alight-shielding layer. The light-shielding layer 122 is configured toshield areas other than the color resist units 124 to (1) prevent lightleakage from a backlight of a thin-film transistor liquid-crystaldisplay, thereby improving a contrast ratio of the display; (2) preventthree primary color lights, generated by light from the backlightpassing through adjacent red, blue, and green photoresist blocks of thecolor resist units 124, from being mixed, thereby improving color purityof the display, and (3) prevent light from causing malfunction of thethin-film transistor 111 and changing the operating parameters of thethin-film transistors 111. The light-shielding layer 122 may be composedof a black resin, a single-layer of chromium (Cr), or a double-layer ofchromium (Cr)/chromium oxide (CrOx).

In an embodiment, the array substrate 100 further comprises a pluralityof columnar photo spacers (not shown) disposed on the overcoat layer inthe display area to prevent a cell gap of the display from being changeddue to pressure. The photo spacers have a same height to maintainuniformity of the cell gap.

The present disclosure further provides a liquid crystal display panelcomprising the aforementioned array substrate 100.

The present disclosure further provides a method for detecting alignmentaccuracy of a color resist layer, comprising steps S51-S53.

Step S51: providing an array substrate 100. The array substrate 100comprises a substrate 101, a plurality of thin-film transistors 150, aplurality of signal lines 140, a plurality of color resist units 124,and a dummy color resist unit 130. The substrate 101 comprises a displayarea 110 and a non-display area 120 surrounding the display area 110.The thin-film transistors 150 are disposed on the display area 110 ofthe substrate 101. Each of the thin-film transistors 150 comprises agate electrode layer 151, an insulating layer 152, an active layer 153,and a source-drain layer 154. The signal lines 140 are disposed on thedisplay area 110 of the substrate 101. The signal lines 140 and the gateelectrode layer 151 of the thin-film transistors 150 are made of a samematerial and are electrically connected to each other. The color resistunits 124 are disposed on the thin-film transistors 150 and thesubstrate 101 in the display area 110. The dummy color resist unit 130is disposed on a periphery of the display area 110 of the substrate 101.The dummy color resist unit 130 is made of a same material as the colorresist units 124. A side or a center point of the dummy color resistunit 130 is designed to be at a predetermined distance from one of thesignal lines 140.

Step S52: measuring a distance of the side or the center point of thedummy color resist unit 130 to the signal line 140 designed to be at thepredetermined distance from the side or the center point.

Step S53: comparing the measured distance with the predetermineddistance.

In an embodiment, the dummy color resist unit 130 is shaped as aquadrangle and has a first side 131, a second side 132, a third side133, and a fourth side 134. The signal lines 140 comprise a first signalline 141, a second signal line 142, a third signal line 143, and afourth signal line 144 which are adjacent to and parallel to the firstside 131, the second side 132, the third side 133, and the fourth side134, respectively. The dummy color resist unit 130 is set as follows:the first side 131 is at a predetermined distance a from the firstsignal line 141, the second side 132 is at a predetermined distance bfrom the second signal line 142, the third side 133 is at apredetermined distance c from the third signal line 143, and the fourthside 134 is at a predetermined distance d from the fourth signal line144. The predetermined distances a, b, c, and d may be equal, unequal,or partially equal. In this embodiment, step S52 is measuring a distanceof the first side 131 of the dummy color resist unit 130 to the firstsignal line 141, a distance of the second side 132 of the dummy colorresist unit 130 to the second signal line 142, a distance of the thirdside 133 of the dummy color resist unit 130 to the third signal line143, and a distance of the fourth side 134 of the dummy color resistunit 130 to the fourth signal line 144. Step S53 is respectivelycomparing the measured distances of the first side 131 to the firstsignal line 141, the second side 132 to the second signal line 142, thethird side 133 to the third signal line 143, and the fourth side 134 tothe fourth signal line 144 with the predetermined distances a, b, c, andd to estimate alignment accuracy of the color resist units 124.

In the above, in an array substrate and a method for fabricating thesame, a method for detecting alignment accuracy, and a liquid crystaldisplay panel which are provided by embodiments of the presentdisclosure, a dummy color resist unit is disposed on a periphery of adisplay area of a substrate, and each side of the dummy color resistunit is designed to be at a predetermined distance from an adjacentsignal line. The sides of the dummy color resist unit have different,same, or partially-same predetermined distances. Therefore, it is onlynecessary to measure a distance between each side of the dummy colorresist unit and a signal line adjacent to it, and compare the measureddistance with the predetermined distance to estimate alignment accuracyof color resist units. The array substrate and the method forfabricating the same, the method for detecting alignment accuracy, andthe liquid crystal display panel do not need to dispose detection unitsin a non-display area of the array substrate, so that an area of thenon-display area can be reduced to achieve ultra-narrow frame design ofthe display panel. This solves the problem of limiting narrowing of aframe of a display panel due to detection units being disposed in anon-display area of a COA array substrate in the prior art.

The present application has been described in the above preferredembodiments, but the preferred embodiments are not intended to limit thescope of the present application, and those skilled in the art may makevarious modifications without departing from the scope of the presentapplication. The scope of the present application is determined byclaims.

What is claimed is:
 1. A method of fabricating an array substrate,comprising: providing a substrate comprising a display area; forming aplurality of thin-film transistors and a plurality of signal lines onthe display area of the substrate, wherein each of the thin-filmtransistors comprises a gate electrode layer electrically connected toone corresponding signal line of the signal lines; and forming aplurality of color resist units on the thin-film transistors in thedisplay area while forming a dummy color resist unit on a periphery ofthe display area of the substrate, wherein the dummy color resist unitis shaped as a quadrangle, and a side of the dummy color resist unit isat a predetermined distance from one signal line of the signal linesadjacent and parallel to the side of the dummy color resist unit a sideor a center point of the dummy color resist unit is designed to be at apredetermined distance from one of the signal lines.
 2. The method offabricating the array substrate according to claim 1, wherein the dummycolor resist unit is formed at a corner or a side of the display area ofthe substrate.
 3. An array substrate, comprising: a substrate comprisinga display area; a plurality of thin-film transistors disposed on thedisplay area of the substrate, wherein each of the thin-film transistorscomprises a gate electrode layer; a plurality of signal lines disposedon the display area of the substrate and electrically connected to thegate electrode layers of the thin-film transistors; a plurality of colorresist units disposed on the thin-film transistors in the display area;and a dummy color resist unit disposed on a periphery of the displayarea of the substrate, wherein the dummy color resist unit is shaped asa quadrangle, and a side of the dummy color resist unit is at apredetermined distance from one signal line of the signal lines adjacentand parallel to the side of the dummy color resist unit a side or acenter point of the dummy color resist unit is designed to be at apredetermined distance from one of the signal lines.
 4. The arraysubstrate according to claim 3, wherein the dummy color resist unit isformed at a corner or a side of the display area of the substrate.
 5. Amethod for detecting alignment accuracy of a color resist layer,comprising: providing an array substrate comprising a display area,wherein the display area is provided with a plurality of thin-filmtransistors, a plurality of signal lines electrically connected to thethin-film transistors, a plurality of color resist units disposed on thethin-film transistors, and a dummy color resist unit disposed on aperiphery of the display area, and wherein a side or a center point ofthe dummy color resist unit is designed to be at a predetermineddistance from one of the signal lines; measuring a distance from theside or the center point of the dummy color resist unit to the one ofthe signal lines designed to be at the predetermined distance from theside or the center point; and comparing the measured distance with thepredetermined distance.
 6. The method for detecting the alignmentaccuracy of the color resist layer according to claim 5, wherein thedummy color resist unit is formed at a corner or a side of the displayarea of the substrate.
 7. The method for detecting the alignmentaccuracy of the color resist layer according to claim 5, wherein thedummy color resist unit is shaped as a quadrangle, and each side thereofa side of the dummy color resist unit is designed to be at thepredetermined distance from one signal line of the signal lines adjacentand parallel thereto to the side of the dummy color resist unit.